Aside from the front of the frame, where else is it marked "20"?
The first of your last 3 photos looks like the front of the grip frame has been filed back to remove previous numbers. I say that judging by the curve in front of the take-down lever, AND the rails of the barrel extension sticking forward vs. being flush.
Also note the military location number (0) on the commercial side plate.
Things just don't add up to a factory gun, interesting as they may be.
dju
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